brown



. June 25, 1929. c. D. BROWN y 1,718,918

wARP STOP MECHANISM FOR Loms l Filed Feb, 14, 1928 3 Sheets-Sheet 1 INVENTOR @f2/m ATT() R N EY Jlm 25, Q D MBROWN 1.718.918

WARP STOP MECHANISM FOR LOOMS Filed Feb. 14, 1928 :sheets-sheet 2 INVENTOR.

ATTORNEY June 25, 1929. c. D. BROWN 1,718,918

WAR? STOP MECHANISM FOR Looms y Filed Feb.,14, 192e s sheets-sheet vs INVENTOR ATTORNEY Patented June 25, i929.

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ic igi `CARL D. BROWN, OF EOPEDALE, MASSACHUSETTS, ASSTGNOR TO DRAPER CORPORA- TION, OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

WARE' STOP MECHANISM FOR LOOMS.

Application filedpFebruary `14:, 1928. Serial No. 254,201.

rihis invention relates to warp stop mechanism for looms wherein a normally operated detecting member' is adapted to be arrested in its movement when a. warp thread breaks or becomes too.slack for weaving purposes, and thereupon elicct loom stoppage. l

Mechanical warp stopmechanisms are oi' two general types, one in which the detecting member is given a movement in the general direction of the warp threads, and the other in which the detecting member is given movement transversely of the loom.

The present invention is more particularly directed to the second of Vthe above types of warp stop mechanisms, and in one aspect et` the invention it is a further development ot the warp stop mechanism shown and described in the patent to Harry A. Davis and Arthur S. Johnson, No. 1,538,625, dated hay l), 1925. `f

L@ne of the objects of the present invention is to simplify the warp stop mechanism ot the transversely movable detector bar type and 'to effect loom stoppage when a drop wire fails to be nornrally supported by a. warp thread.

In the warp stop mechanism of the Davis and Johnson patent a series of yieldingly mounted actuators were connected vto vthe transversely movable detector bars, and upon tilting movement of one ot the actuators relative to its carrying meansa train ot mechanism was set in operation to effect loom stoppage, such mechanism including a stop finger and associated parts. lV ith respect to this feature the present invention comprehends the yieldingly operate-d actuators tor one or more detecting bars and a stop bar, one at each side of the yieldingly mounted actuator, so that should an actuator' be held from movementrby stoppage of the detector bar, one of the stop bars will act through a train of mechanism to ctliect loom stolipage.

lt is now the ordinary practice to connect the actuator to the detecting bar by a link which may be positively connected to the detecting bar or detachably connected thereto by a pin and slot througha link carried by one et the parts to be connected. On one hand, it is desirable at times to disconnect the actuator' from its detecting bar, so that the general practice has new been to detachably connect the actuator and detecting bar by a link having an open-ended slot to engage a pin on the detecting bar. This construction, however, introduces an obiection in that the loom attendant while pieci'ng up Aprotect-ion against accidental disconnection and yet permit intentional disconnection `ot the actuator and detecting bar. f

The invention and novel features thereof and new combinationof parts willbest be made clear from the following description and the accompanyingdrawings of one embodiment thereof.

In the drawings:

Fig. l is a perspective view at one end portion of a warp stop mechanism embodying the present invention;

Fig. 2 is an elevation of the warp stop mechanism embodying the present invention, some of the parts beingbroken away and one of the drop wires being shown as arresting a detector bar;

Fig. 3 is a sectional side elevation with some of the parts omitted, showing more particularly the yieldingly mounted bar actuator connected to its detecting bar and the stopv bars embracing the actuator;

Fig. 4- is a section on the line 5 5 of Fig. 3 showing the manually operable lock inits detaching position.

As is usual with warp stop mechanisms of the transversely movable detecting bar type, a. l racket is secured at each side of the loom for supporting the warp stop mechanism, and .in the present instance oi? the invention, as indicated in Figs. l and 2, the loom frame is provided with a bracket support l adapted to sustain a bracket 2, one at each side of the loom, and, as usual in warp stop mechanisms, means are provided for effecting adjustment ot the bracket 2 on its supporting member. In the present instance oi the invention, a bolt 3 and appropriate slots 4E and 5 serve to adjustably support each et' the brackets 2, one at each side of the loom, in the position of adjustment.

Connected to the opstanding portion G of each of the brackets 2 are the side members 7 of the warp stop mechanism. Extending between the side members 7k are the Warp supports 8 and 9 over which Vthe warp threads a pass and by which they are supported. The parts so far described are of usual construction and need no further` description.

Extending between the side members 7 are tixed toothed detecting bars v10 each ot which has associated vwith it a transversely movable toothed detecting bar 11 which may be guided in its transverse movement ot the loom by a slot formed in the Vfixed detecting bar 10. Obviously there may be any number ot detecting bars appropriate to the character of the loom in use and number ot warp threads, and in the present instance ot the invention there are shown tour ot such detecting bars cooperating with a corresponding series ot drop wires.

The drop wires 12 may likewise be ot usual construction Aand as shown in the present instance et the invention they are ot the general hairpin type of drop wire, each having a slotted vopening atits upper end through which the toothed detecting bars extend, and the lower portion of each drop wire is provided with an opening through which a warp thread passes and by which the drop wire is held in itsnormally raised. position during weaving.' The form et the drop wire that has been described is preferred, though any usual form of drop wire ,may be employed, the essentials in this respect being that a series of drop wires has associated with it a toothed detecting be and when the drop wire is normally held in raised position by the warp thread engaged by it, it will permit tree movement ot the movable detecting bar, but should a warp thread become broken or too slack for weaving purposes, thedrop wire will engage between'the teeth of the movable detecting bar and arrest its movement as usual in this type of warp stop mechanisms.

Pivotally mounted on each of the side supports or brackets 7 is a stringer cap which, in normal position during weaving. holds the detecting bars in place. In the present instance of the invention 'each stringer cap 15 is provided with a slotted lug or downward extension 1G which embraces a pivot or stud 17 mounted at one end of each ot the side supports or brackets 7, whereby the stringer caps 'may be turned from their normal position overlying the detector bars to a substantially horizontal position. An adjusting screw 18 is associated with each Stringer cap and threaded .into the pivot stud 17, wherebyithe Stringer caps may be raised or lowered bodily.

Mounted in suitable bearings 23, one at each side ofthe stop motion is a rock shaft 24; to which are secured the rockers 25,`and the desired connection between the rockers and the rock shaft may be readily eliected by means of a locking screw 2G, the construe tion being such that as the rock shaft is given its rocking movement the series ot rockers will be rocked therewith.

As indicated more particularly in Figs. 3 and 4l, each ot the rockers 25 is provided with a tulcrum seat 27, one at each side of the vertical plane passing through the rocking axis ot the rockers. Mounted upon each et the rockers 25 is a detecting bar actuator 23, each ot which. has two pins 29 on its lower portion adapted to be seated in the fulcrum recesses 27 ot the associated rocker 25, and by a spring 30 connected at its upper end to the actuator 28, by a pin 31, and at its lower end by a part 32 carried by the associated rocker, the actuators are normally held in their operating position as indicated in Fig. Each ot the detecting bar actuators 28 is connected to its associated detecting bar and should the latter be arrested in its movement by a drop wire, its actuator 2S will likewise be arrested while the rocker itself continues its movement, a condition wnich is eitected by means oi' the yielding connection or spring 30 between it and its rocker.

Loose-ly mounted upon the rock shaft 24E are the stop bar carriers 33, two at each side ot the warpstop mechanism, as indicated more clearly in Fig. 1. Exending between the stop bar carriers 33 are the stop bars 3e which may be appropriately secured to the associated carriers by means et set screws 35, and the two stop bars 34 normally embrace the actuators or series ot actuators 28, and, as will presently appear, yielding means are provided tor holding the stop bars 34 in the described relation to the actuators.

Oneof the stop bars 34 has secured thereto the link 36 which is providedvwith a slot 37 into which the opposite or companion stop bar 34 extends.

Mounted in the slotted portion ot thelink 3G is a plunger 33 which is normally under the influence of a spring 39 serving to hold the end ot the plunger against the stop bar in the slot ofthe link, with the result that the two stop bars are normally held in yielding relation against opposite sides of the actuator orI actuators. The plunger 38 may be appropriately carried by a sleeve 40 which may be secured by a screw bolt l1 to the link 36, and bearing upon the enlarged portion 4t2 ot' the plunger is the end ot a flexible sheathed wire 43, which serves to transmit longitudinal movement otl the plunger to thereby call into action the stop mechanism. The details ot the stop mechanism are not herein shown, as they may be of any appropriate character, as, for instance, that disclosed by the Davis and Johnson patent, hereinbefore mentioned.

From the construction thus far described it will be apparent that should one ot the detecting bar actuators be arrested in its movement, it will act through one of the stop bars 34 to arrest such stop bar, whereupon the other stop bar which is moved by the actuators will act, either through the link 3G or the stop bar in the slot of the link, to cause relative movement of the plunger and the linlr to thereby move the sheathed wire -l-l and eil'ect loom stoppage. rlhis condition is illustrated in F ig. 2, wherein the stop bar at the, right has been arrested, while the other stop bar at the left continues to move, with the iesult that the link is moved by the stop bar 3ft to which it is secured to cause relative movement between the link and the plunger and effect loom stoppage as described.

lilach of the actuators 28 contained in the warp stop mechanism is detachably connected to its transversely movable detector har so that the two may be disconnected at will, and the connecting means has associated therewith a manually operable locli whereby accidental disconnection of the actuator and its detecting bar is prevented. This locking feature may take various forms, but as indicated in the prese. tinstance of the invention and as moie clearly shown by 3 and d, the actuator 28 is provided with a manually operable slide fle, the lower end portion of which is bifurcated, as at e153, to engage a pin i6 connected to the movable detecting bar, the construction being such that when the slide is moved downwardly relative to the connected actuator, the bifurcated end 45 will engage the pin -ltl and upon movement of the actuator impart movement to the detecting bar.

iis indicated in Figs. 3 and t, the actuator 28 is provided with the pins l? which engage the elongated slots t8 in the slide del, the enlargedoverlying heads al!) of the pins acting to hold the slide and actuator in operative relation. lVhen the slide let is moved downwardly to eng' e the pin of its ssociated detector bar, it is important thatsuch connection be not accidentally disturbed by the loom attendant in pieeing up or manipulating parts of the loom about the warp stop mechanism, and one means to this end consists in a manually operable lock to prevent such accidental disconnection between the actuator and its associated detecting bar.

A good form of such loci; is shown by Figs. 3 and et, wherein the slide le has moi-mined thereon a projection 50 which may be suitably formed as a sphere held in a .suitable 'recess in the slide dand adapted to engage one of two openings 5l, 52 in a strap 53 which overlies the projection or ball 50 in the slide and is held in place by engaging beneath the enlarged heads i9 of the pins eti'. rlhe strap 53 Vis appropriately formed as a leaf spring, with the result that when the slide 44k is in its upper position as indicated in Fig. Il and the ball or sphere 50 is engaged with the upper opening 5l in the strap, the slide will be held iii its locked position, thus freeing the connection between the actuator and its associated detecting bar; and similarly, when the slide lit is in its lowered position as indicated in Fig. 3, to which position it may be readily moved by manual effort, the sphere oi' ball 5() will engage the lower opening 52 in the strap and maintain the actuator locked to its detecting bar.

Anysuitable means may be employed for .imparting to the rock shaft 2a and the rockers 25 the desired rocking movement, but in the present instance of the invention the rock shaft 2dhas secured thereto an arm 'the end portionof which is provided with a slot'55 which is engaged by a pin 5G connected by an arm 5i' with the upper end portion of'an actuating member 59 which may be given. its desired movement to elliect actuation of the rock shaft and rochers from aii 7 suitable going part of the Vknown vin the art.

lt is sometimes expedient to position the fixed member llt) or the detector mechanism by inserting such fixe-:l member eiidwise from either side of `the stop motion and then inserting the movable member ll, which cai'- ries the pin il-tl from the right of the stop motion, shown. This is rendered possible in the present invention by forming the fixed iember 10 with a reduced portion G0 at its end, so that the movable member may be inserted from the right of the stop motion, as shown, the pin'iG at such time being freely movable along the reduced portion of the fixed member. i

Vvlhat is claimed is:

l. lfn a warp stop mechanism for looms, the combination of a series of .drop wires normally supported by the warp threads during weaving, a transversely movable toothed detecting bar adapted to be arrested by a' drop wire, a rocker, a detector bai' actuator yieldingly mounted on, the rocker and connected to the toothed detecting bar, a stop bar at each side of the actuator, yielding means normally acting to maintain the stop bars in engagement with the detector bar actuator for movement therewith, and means actuated by one of the stop bars to effect loom stoppage.

2. In a warp stop mechanism for looms, the combination of a series of drop wires normally supported by the warp threads during weaving, a transversely movable toothed detecting bar adapted to be arrest-ed by a drop wire, a rock shaft and actuating means therefor, a detector bar actuator yieldingly connected to the rock shaft for llO rockingr movement therewith, a stop bar at each side oi the aci'uotor, a stop link secured to one of the stop bars for movement therewith, yielding means acting through the other stop bar to maintain both stop bars in engagement with the detecting bar actuator, and means actuated by movement of the link with its connectedv stop bar to cause the other stop bar to effect loom stoppage.

In a Warp: stop motion of the transversely movable toothed: bar type, a series or' drop Wires, a yieldingly mounted bar actuator and: operating means therefor, a stop bar at each side ofv the bar actuator, a link connectedto one of the stop bars lor movement therewith and having relatively movable connections with the other stop bar,

yielding means normally acting between the tivo stop bars to maintain them in engage-- therewith forefecting loom stoppage.

l. In a Warp stop mechanism for looms, thel combination of a series oi drop Wires, a transversely movable toothed detecting bar, a yieldingly mounted bar actuator' and operating means therefor, a stop bar at each side of the bar actuator', a link secured to one of the stop bars and having a cIlot connection with the other stop bar, yielding means acting through the link upon one of the stop bars to maintain both stop bars in engagement with the toothed bar actuator, and means actuated by relative movement of the stop bar in the slot of the link to eliject loom stoppage. Y

ln a Warp stop mechanism for looms, the combination of a series of drop Wires, a transversely movable toothed detecting bar, a. yieldingly mounted bar actuator and operating means therefor, a stop bar at each side of the liar actuator, a link secured to one of the stop ,bars and having a slot connection with the other stop ba r, a yieldingly mounted plunger coi'inected to the slotted link and bearing upon the stop bar therein to maintain the two stop bars in engagement with the actuator, and means actuated' by the plunger when moved longitudinally relative to the link by its adjacent stop bar to effect loom stoppage.

G.A n a Warp stop mechanism for looms, the combination of a` series of drop Wires, a transversely movable toothed detecting bar, a. yieldingly mounted bar actuator and operating means therefor, a stop bar ei:- tending transversely of the bar actuator at each side thereof, a link secured to one oi the stop bars and having a sliding connection Withy the oppositestop bar, a plunger carried by the link and yieldingly impelled intoy engagement with said last named stop bar and acting through the link to maintain mlaols the stop bars in engagement with the actuator, and means actuated by the plunger when moved relative to the link to eifeet loom stoppage.

7. Inv a vvarp stop mechanism for looms, the combinationy of a series of drop wires, transversely movable detecting bars, a rock shalt carrying a series of rockers, detecting bar actuators mounted on the rockers and each connected with. a detecting bar, a stop bar extending transversely of the actuators at each sidethereof, a link secured to one of the stop bars and having a sliding connection With the other stop bar, a yielding memer carried by the slotted portion of the link and bearing against the adjacent stopv bar,

and means actuated by the yielding member 'toy eifcct loom stoppage When the yielding member and slotted link are relatively moved by one of the stopV bars.

8. In a Warp stop mechanism of the transversely movable detector bar type, the combination of a series of drop Wires norm-ally supported by the Warp threads during weaving, a detector bar provided With a series of teeth projecting from its upper edge and' having a detecting movement lengthwise in a direction transversely of the loom and vadaptedto be arrested by a fallen drop Wire,

a rocker, a link connected to the transversely movable toothed detector bar for moving it transversely of the loom, tivo independently mounted rigid stop bars extending from front to rear or" the Warp stop mechanism. and normally operated' in a direction length- Wise of the toothed detector bar by rocking movement ol' the rocker, a; spring normally acting between the rigid stop bars to' cause them to move in unison With the rocker, and transmission mechanism actuated by one of the stop bars when it is arrested by thc occurrence of a Warp fault to eli'ect loom stoppage.

9. In a Warp stop mechanism 'for looms, the combination of a series of drop Wires normally supported by the Warp threads during Weaving, a. series of transversely movable detector bars, a rocker `tor imparting transverse movements to the series ot detector bars, two stop bars independently mounted and extending in a direction transversely of the series of detector bars one at each side of the rocker, a spring acting normally to yieldingly hold the stop bars for movement in unison With the rocker, and mechanism actuated when either stop bar is arrested to cause loom stoppage.

l0. In a Warp stop mechanism for looms, the combination" of a. series of drop Wires normallyv supported by the Warp threads during Weaving, a rock shaft," a rocker mounted on the rock shaft, a transversely movable toothed detector bar actuated from the rocker, independent stop bar carrier arms loosely mounted Von the rock shaft, stop bars llo mounted on the Carrier arms above the roch shaft one at each side olE the rocker, a spring` yieldingly acting to hold the stop bars towards each other, and a train of mechanism actua-ted by either stop bar when it is arrested to effect loom stoppage.

ll. In a warp stop mechanism for looms, the Combination ot a series of drop wires normally supported by the Warp threads during weaving, aroek shaft, a. rot-,lier mounted on the rock shaft, a transversely 'movable toothed detector bar actuated from the rocker, independent stop bar carrier `arms loosely mounted on the rock shaft and diverging upwardly therefrom, stop bars mounted on the Carrier arms above the rock shaft one at each side oit the r cker, a spring` ),fielllingly acting to hold the stop bars towards each other, and a train of mechanism actuated by either stop bar when it is arrested to effect loom stoppage.

In testimony whereof, I have signed my name to this speetieation.

CARL D. BROWN 

